Naslov
Cooling of sphere due to natural convection - a test of lumped model approach

Autori
Virag, Zdravko ; Živić, Marija ; Krizmanić, Severino ; Veljić, Nataša

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
MATE Thermo Hungary / Benko, Imre - Budimpešta : Scientific Society of Measurement, Automation and Informatics (MATE), 2007, 82-83

ISBN
978-963-06-3722-0

Skup
15th International Conference on Thermal Engineering and Thermogrammetry (THERMO)

Mjesto i datum
Budimpešta, Mađarska, 26.06.2007. - 29.06.2007

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
cooling of sphere; lumped model; natural convection; heat transfer correlation

Sažetak
The cooling of the hot sphere immersed in initially quiescent fluid is technically relevant problem. The three approaches for prediction of time variation of the sphere temperature and heat transfer rate between the sphere and the fluid are compared. The first approach is based on solving of the full mathematical model by means of commercial CFD software. The second approach is based on lumped model and Churchill's correlation function for the heat transfer coefficient which is solved using Runge-Kutta method. The third approach is based on further simplification of the lumped parameter model by assuming a constant heat transfer coefficient so the analytical solution can be obtained. It is concluded that in the considered case the second approach, which is considerably cheaper than the first approach offers results reasonably close to the results of the first approach. In the case when the rate of cooling is of interest the third approach is not a good choice.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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